package org.casper.randcode;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class VerifyCodeServlet
 */
@WebServlet("/VerifyCodeServlet")
public class VerifyCodeServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
        response.setHeader("Pragma", "No-cache");  
        response.setHeader("Cache-Control", "no-cache");  
        response.setDateHeader("Expires", 0);  
        response.setContentType("image/jpeg");  
        //生成随机字串  
        String verifyCode = VerifyCodeUtils.generateVerifyCode(4);  
        //存入会话session  
        HttpSession session = request.getSession(true);  
        session.setAttribute("code", verifyCode.toLowerCase());  
        //生成图片  
        int width = 200, height = 80;  
        VerifyCodeUtils.outputImage(width, height, response.getOutputStream(), verifyCode);  
    }  
}
